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 |  |  | | Jonathan Sadowski |  | | Residence: | New Berlin, WI |
| Birthplace: | Unknown | | Age: | Unknown | | Height: | Unknown | | Plays: | Unknown | | Coaching: | Unknown |  | | Complete Bio | |
WI Spring Closed B14 Dst. Chmp., May 25, 2012
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 16 | Win | Aaron Holman | | 6-7(3); 6-4; 6-3 | | Q | Win | Gunther Treis | | 6-2; 6-2 | | S | Win | Benjamin Sinense | + | 6-1; 6-0 | | F | Loss | Ethan Budiono | | 2-6; 6-2; 6-1 |
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Lake Country B18-10 Open L6, July 20, 2012
 Le Club Jr. Summer Open L6, July 30, 2012
 Princeton Club Fall Open L6, August 3, 2012
 WRC Moorland Fall B18-14 Open L6, September 7, 2012
 Le Club Fall Open L6, September 28, 2012
 North Shore Elite BG18-16 L6, October 19, 2012
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 16 | Loss | Ethan Budiono | | 6-1; 6-0 | | 1 | Loss | Eric Stodola | | 6-4; 6-4 |
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Princeton Club B14-10 L6, December 7, 2012
 North Shore Elite Holiday Open L6, December 26, 2012
 Wisconsin Jr. Indoors BG12, February 8, 2013
 Four Lakes B14-12 Challenger L6, March 8, 2013
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 16 | Win | Noah Colletti | | 6-1; 6-4 | | Q | Win | Nicholas Yang | | 6-2; 6-0 | | S | Win | Jake Zehms | | 6-0; 6-3 | | F | Loss | Evan Sadowski | | 6-0; 6-1 |
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River Glen Elite Jr. L6, March 22, 2013
 North Shore Elite Open L6, April 12, 2013
  |  |  Rnd |  Result |  Opponent |  Rank |  Score | | 16 | Win | Ari Robinson | | 6-0; 6-0 | | Q | Win | Rohan Gupta | 441 | 6-0; 6-3 | | S | Win | Nicholas Yang | | 6-4; 7-6(7) | | F | Loss | Sean Bailey | | 6-0; 6-1 |
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+ Strong win over an ineligible player.
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